In late 2023, Amsterdam introduced a 30 km/h limit. A large number of arterials were lowered from 50 km/h, 4,500 signs installed, 140 lights reconfigured, and 200 km of markings adjusted. Aiming to improve safety, liveability and accessibility, 80% of the road network is now at this critical speed. The effects of this measure were monitored before and after its implementation. Six topics were considered: 1️⃣ Road safety: On the 30 km/h roads, there were 11% fewer collisions involving a car, 15% fewer collisions involving a pedestrian or cyclist, and 24% fewer collisions involving a tram or bus. 2️⃣ Liveability: Noise pollution dropped by 1.5 decibels, or 5.5% on the logarithmic scale. Researchers observed an increase in social interactions at street level. 3️⃣ Speeds: Overall speeds decreased by 8%, with a 63% limit compliance rate. There was an 80% reduction in severe speeding (over 55 km/h). 4️⃣ Travel times: There was no measurable effect on emergency service response times. An average car journey experienced 30 seconds of delay. 5️⃣ Traffic volume: Despite 1% population growth, car traffic and air pollution remained unchanged. 6️⃣ Support: 60% of residents were very positive of the measure. One year since its introduction, figures show the stated goals behind Amsterdam's 30 km/h measure are trending in the right direction, and concerns of negative impacts are unwarranted. This aligns with—and adds to—the growing body of evidence that other global cities should consider a similar move.
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